Brown, RObert Wade
McGraw-Hill, 1997
Buku Teks
Brown, RObert Wade
McGraw-Hill, 1992
Buku Teks
Peck, Ralph B. (Ralph Brazelton), author
Charles E. Tuttle, 1953
Buku Teks
Martin, James, author
Prentice-Hall, 1995
Buku Teks
Peck, Ralp B.
Wiley, 1974
Buku Teks